Regardless of what it 'feels' like, the car is doing the speed indicated by the gauges, trust me...
It's because you're looking at the road through a screen covering maybe 20 degrees of your real FOV (field of view) that's trying to show a display covering 90 degrees. You can see the same effect on those police chase video shows where the camera car is doing 100mph but it looks like about 30mph because the camera is zoomed right in.
As blackout says, have a play with the FOV settings and you can get more of the sensation of speed - the higher the FOV, the faster it 'feels' but you get more distortion of the image, as the screen is only so big. The right setting for you will be a compromise between the two.